<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .box{
            width: 90%;
            margin: 0 auto;
            overflow: hidden;
            position: relative;
        }
        ul{
            display: flex;
            position: relative;
            left: 0;
            transition: left .2s linear;
            
        }
        ol{
            display: flex;
            position: absolute;
            bottom: 10px;
            width: 100%;
            left: 0;
            justify-content: center;
        }
        ol > li{
            width: 10px;
            height: 10px;
            background-color: #fff;
            margin: 0 8px;
        }
        ol > li.action{
            background-color: black;
        }
        img{
            border-radius: 5px;
            display: block;
        }
        .boximg{
            width: 90vw;
            
        }
        .box span{
            border: 1px solid #000;
            padding:0 10px;
            position: absolute;
            line-height: 40px;
            top: calc(50% - 20px);
            background-color: rgba(255, 255, 255, 0.595);
        }
        .prev{
            left: 0;
        }
        .next{
            right: 0;
        }
    </style>
</head>
<body>
    <div class="box">
        <ul>
            <!-- <li>
                <img src="" alt="">
            </li> -->
        </ul>
        <ol>
            <!-- <li></li> -->
        </ol>
        <span class="prev">上一张</span>
        <span class="next">下一张</span>
    </div>
    <script>
        var image = ["https://m15.360buyimg.com/mobilecms/s1062x420_jfs/t1/33428/39/16450/106681/6311cad7Ef9b3d856/f10720b7f8f38937.jpg!cr_1053x420_4_0!q70.jpg",
        "https://m15.360buyimg.com/mobilecms/jfs/t1/3230/40/20384/44107/62daf2d9E5c5e0e55/03ab360c40ddc266.jpg!cr_1125x449_0_166!q70.jpg",
        "https://m15.360buyimg.com/mobilecms/jfs/t1/110775/22/28940/94917/62e5bc6dE569b2244/5d14fc9f06d87341.jpg!cr_1125x449_0_166!q70.jpg",
        "https://m15.360buyimg.com/mobilecms/s1062x420_jfs/t1/33428/39/16450/106681/6311cad7Ef9b3d856/f10720b7f8f38937.jpg!cr_1053x420_4_0!q70.jpg",];
        
        var ul = document.querySelector(".box > ul");
        var ol = document.querySelector(".box > ol");
        var box = document.querySelector(".box");
        
        var str = "",str1 = "";
        for(var k = 0;k < image.length;k++){
            // console.log(image[k]);
            str += `<li><img class="boximg" src="${image[k]}" alt=""></li>`;
            if(k == 0){
                str1 += `<li class="action"></li>`
            }else if(k < image.length - 1){
                str1 += `<li></li>`
            }
        }
        ul.innerHTML = str;
        ol.innerHTML = str1;
        ul.style.width = image.length * box.offsetWidth + "px";



        // 点击上一张下一张
        // 自动轮播
        // 取消自动轮播
        // 点击小圆点
        var prev = document.querySelector(".prev");
        var next = document.querySelector(".next");
        var ollis = document.querySelectorAll(".box > ol > li");

        // 当前显示图片的索引值
        var i = 0;

        next.onclick = nextFun;
        function nextFun(){
            i++;
            // 设置ul的移动
            ulLeft()

            // 在点击下一张时,判断如果是最后一张了(复制的第一张)
            // 需要在动画执行完成后瞬间跳到第一张
            if(i == image.length - 1){  //i == 3
                i = 0;
                setTimeout(function(){
                    ul.style.transitionDuration = "0s";
                    // ul.style.left = 0;
                    ul.style.left = "0px";
                },200)
            }
            yuan()
        }


        prev.onclick = function(){
            i--;
            if(i == -1){
                i = 2;
                ul.style.transitionDuration = "0s";
                var l = (i + 1) * -box.offsetWidth;
                ul.style.left = l + "px";
            }
            setTimeout(ulLeft,10)
            yuan()
        }


        function yuan(){
            for(var n = 0;n < ollis.length;n++){
                ollis[n].classList.remove("action");
            }
            ollis[i].classList.add("action");
        }

        function ulLeft(){
            ul.style.transitionDuration = "0.2s";
            var l = i * -box.offsetWidth;
            ul.style.left = l + "px";
        }

        for(let m = 0;m < ollis.length;m++){
            ollis[m].onclick = function(){
                i = m;
                ulLeft()
                yuan()
            }
        }

        var time = setInterval(nextFun,2000);
        box.onmouseenter = function(){
            clearInterval(time);
        }
        box.onmouseleave = function(){
            time = setInterval(nextFun,2000);
        }
       
    </script>
</body>
</html>